The American Journal of Science, Volume 139

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J.D. & E.S. Dana, 1890 - Earth sciences
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Page 25 - their old home were to migrate in a body into a new and afterwards isolated country, they would be little liable to modification; for neither migration nor isolation in themselves effect any thing. These principles come into play only by bringing organisms into new relations with each other, and in a lesser degree with the surrounding physical
Page 150 - a uniform curve would be inapplicable in such a case, as it would lead us to expect elements possessed of special properties at any point of the curve. The periods of the elements have thus a character very different from those which are so simply represented by geometers. They correspond to points, to numbers, to
Page 22 - Intercrossing will affect those animals most which unite for each birth and wander much, and which do not breed at a very quick rate. Hence with animals of this nature, for instance birds, varieties will generally be confined to
Page v - vol. 23, pp. 1-25. Read in NAS November, 1881. (Mean annual rainfall for different countries of the globe ; cases of excessive rainfall; cases of deficient rainfall.) 154. Contributions to meteorology, being results derived from an examination of the observations of the United States Signal Service and
Page 150 - and silicon, we must recognize a problem to which no direct application of the analysis of the infinitely small can be made. Therefore neither the trigonometrical functions proposed by Kidberg and Flavitzky nor the pendulum-oscillations suggested" by Crookes, nor the cubical curves of the Rev. Mr. Haughton, which have been proposed for expressing the periodic law,
Page 153 - rains. By virtue of these films the sand-grains become separated by elastic cushions of condensed gases, capable of considerable vibration, and whose thickness has been approximately determined. The extent of the vibration and the volume and pitch of the sound thereby produced, after any quick disturbance of the sand,
Page 148 - determines the character of the element just as the magnitude of the molecule determines the character of a compound body; (6) we must expect the discovery of many yet unknown elements—for example, elements analogous to
Page 153 - to be connected with thin pellicles or films of air, or of gases thence derived, deposited and condensed upon the surface of the sand-grains during gradual evaporation after wetting by the seas, lakes, or by rains. By virtue of these films the sand-grains become separated by elastic cushions of condensed gases, capable of considerable vibration, and whose thickness
Page 25 - one, by many distinct species; but these species are related to each other in a very much closer manner than to the inhabitants of the American continent, or of any other quarter of the world. This is what might have been expected, for islands situated so near each other would almost necessarily receive immigrants from the same original source, and from
Page ii - daily range of the magnetic declination and the number of auroras observed each year, with the extent of the black spots on the surface of the sun. Am. Jour. (3), vol. 5, pp. 243-260. April, 1873. (Palermo, Mem. Spettr.

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